Determine Whether the Series $\sum _ { n = 1 } ^ { \infty } \frac { 3 + ( - 1 ) ^ { n } } { 3 ^ { n } }$

Short Answer

Determine whether the series $\sum _ { n = 1 } ^ { \infty } \frac { 3 + ( - 1 ) ^ { n } } { 3 ^ { n } }$ is convergent or divergent. If it is convergent, find the sum.